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中华医学超声杂志(电子版) ›› 2026, Vol. 23 ›› Issue (06) : 449 -457. doi: 10.3877/cma.j.issn.1672-6448.2026.06.003

腹部超声影像学

超声衍生脂肪分数对MASLD患者肝左右叶的一致性及诊断效能评估
林依婷1, 戚瑞祥1, 贺亭1, 卢利仁1, 张丽青2, 包凌云1,†()   
  1. 1 310000 杭州,西湖大学医学院附属杭州市第一人民医院超声影像科
    2 310000 杭州,西湖大学医学院附属杭州市第一人民医院放射科
  • 收稿日期:2025-09-23 出版日期:2026-06-01
  • 通信作者: 包凌云
  • 基金资助:
    浙江省医药卫生科技计划项目(2025KY1067)

Consistency of ultrasound-derived fat fraction measurements between the right and left hepatic lobes

Yiting Lin1, Ruixiang Qi1, Ting He1, Liren Lu1, Liqing Zhang2, Lingyun Bao1,†()   

  1. 1 Department of Ultrasound, Affiliated Hangzhou First People's Hospital, School of Medicine, Westlake University, Hangzhou 310000, China
    2 Department of Radiology, Affiliated Hangzhou First People's Hospital, School of Medicine, Westlake University, Hangzhou 310000, China
  • Received:2025-09-23 Published:2026-06-01
  • Corresponding author: Lingyun Bao
引用本文:

林依婷, 戚瑞祥, 贺亭, 卢利仁, 张丽青, 包凌云. 超声衍生脂肪分数对MASLD患者肝左右叶的一致性及诊断效能评估[J/OL]. 中华医学超声杂志(电子版), 2026, 23(06): 449-457.

Yiting Lin, Ruixiang Qi, Ting He, Liren Lu, Liqing Zhang, Lingyun Bao. Consistency of ultrasound-derived fat fraction measurements between the right and left hepatic lobes[J/OL]. Chinese Journal of Medical Ultrasound (Electronic Edition), 2026, 23(06): 449-457.

目的

探讨超声衍生脂肪分数(UDFF)在肝左、右叶检测的一致性,并以磁共振质子密度脂肪分数(MRI-PDFF)为参考标准,评估UDFF在代谢功能障碍相关脂肪性肝病(MASLD)的诊断效能。

方法

采用前瞻性单中心研究,纳入2023年2月至2024年5月于杭州市第一人民医院行磁共振质子密度脂肪分数(MRI-PDFF)和超声UDFF检查的101例受检者。以MRI-PDFF为“金标准”,通过组内相关系数(ICC)、Bland-Altman分析、受试者工作特征曲线(ROC)和曲线下面积(AUC)评估UDFF的可重复性、一致性及诊断效能。

结果

本研究最终纳入101例受检者(中位年龄34.0岁;44例男性,57例女性)。肝右叶和肝左叶的UDFF中位值分别为8.0%和11.0%。MRI-PDFF中位值为10.1%。UDFF测量表现出极佳的可重复性(肝右叶ICC=0.952,肝左叶ICC=0.927)。肝右叶UDFF与MRI-PDFF的一致性(ICC=0.904)和相关性(r=0.830)显著优于肝左叶(ICC=0.836,r=0.669)。Bland-Altman分析显示,肝右叶UDFF与MRI-PDFF的平均偏差绝对值(2.0%)略高于肝左叶(1.8%),但其95%界限范围更窄(20.9% vs 29.9%)。肝右叶UDFF对轻度(AUC=0.882)、中度(AUC=0.970)和重度肝脂肪变性(AUC=0.962)的诊断效能表现优异,敏感度分别为78.8%、96.2%和95.0%,特异度分别为93.8%、92.0%和87.7%。肝左叶UDFF的诊断性能稍逊(轻度、中度和重度肝脂肪变性的AUC分别为0.709、0.921和0.942)。

结论

UDFF是一种可靠的无创肝脏脂肪定量工具,为MASLD的临床诊断和分级提供了重要依据。评估肝脏脂肪变性推荐在肝右叶进行UDFF测量。

Objective

To explore the consistency of ultrasound-derived fat fraction (UDFF) measurements between the left and right hepatic lobes, and to evaluate its diagnostic accuracy for metabolic dysfunction-associated steatotic liver disease (MASLD), using magnetic resonance imaging proton density fat fraction (MRI-PDFF) as the reference standard.

Methods

This prospective single-center study included 101 participants who underwent both MRI-PDFF and UDFF examinations at Hangzhou First People's Hospital between February 2023 and May 2024. With MRI-PDFF as the reference standard, the intraclass correlation coefficient (ICC), Bland-Altman analysis, and receiver operating characteristic (ROC) curves were used to assess the repeatability, agreement, and diagnostic performance of UDFF.

Results

A total of 101 participants were enrolled in the final cohort (median age 34.0 years; 44 males and 57 females). The median UDFF values in the right and left lobes were 8.0% and 11.0%, respectively, with an overall median UDFF of 10.1%. UDFF measurements demonstrated excellent repeatability (ICC=0.952 for the right lobe and 0.927 for the left lobe). The agreement (ICC=0.904) and correlation (r=0.830) between right-lobe UDFF and MRI-PDFF were significantly stronger than those for the left lobe (ICC=0.836, r=0.669). Bland-Altman analysis revealed a mean bias of 2.0% for the right lobe versus 1.8% for the left lobe; however, the 95% limits of agreement (LoA) were narrower for the right lobe (20.9% vs 29.9%). Right-lobe UDFF exhibited excellent diagnostic performance for mild (AUC=0.882), moderate (AUC=0.970), and severe hepatic steatosis (AUC=0.962), with sensitivities of 78.8%, 96.2%, and 95.0%, and specificities of 93.8%, 92.0%, and 87.7%, respectively. The diagnostic performance of left-lobe UDFF was slightly inferior, with corresponding AUC values of 0.709, 0.921, and 0.942.

Conclusion

UDFF is a reliable, non-invasive tool for quantifying hepatic steatosis and provides valuable information for the clinical diagnosis and grading of MASLD. For optimal performance, measurement of the right hepatic lobe is recommended.

图1 纳入和排除流程图。 注:MRI为磁共振成像;PDFF为质子密度脂肪分数;UDFF为超声衍生脂肪分数
图2 同一位56岁女性的超声衍生脂肪分数和磁共振质子密度脂肪分数图像。图a为肝右叶超声衍生脂肪分数图;图b为肝左叶超声衍生脂肪分数图;图c为磁共振质子密度脂肪分数图
表1 受检者磁共振成像质子密度不同分级的临床资料及影像脂肪分数
图3 肝右叶与肝左叶的超声衍生脂肪分数(UDFF)散点图及Bland-Altman 差值图。(平均偏差为-3.8%。)图a为肝右叶与肝左叶的超声衍生脂肪分数(UDFF)散点图;图b为肝右叶与肝左叶UDFF的Bland-Altman 差值图。
图4 肝右叶和肝左叶超声衍生脂肪分数(UDFF)与核磁共振质子密度脂肪分数(MRI-PDFF)散点图及Bland-Altman 差值图。(平均偏差分别为-2.0%和1.8%。)图a、b分别为肝右叶和肝左叶超声衍生脂肪分数(UDFF)与核磁共振质子密度脂肪分数(MRI-PDFF)的散点图;图c、d分别为肝右叶和肝左叶UDFF与MRI-PDFF的Bland-Altman 差值图
表2 超声衍生脂肪分数对肝左、右叶脂肪变性的诊断性能
图5 肝左、右叶超声衍生脂肪分数(UDFF)诊断代谢功能障碍相关脂肪性肝病的受试者工作特征曲线。图a为MRI-PDFF值≥6.4%;图b为MRI-PDFF值≥17.4%;图c为MRI-PDFF值≥22.1% 注:AUC为曲线下面积
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